<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/Breadcrumb' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item >商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区 -->
        <el-card>
                <!-- 头部警告区 -->
                <el-alert
                    title="注意：只允许为第三级分类设置相关参数！"
                    type="warning" show-icon :closable="false">
                </el-alert>

                <!-- 选择商品分类区域 -->
                <el-row class="cat_opt">
                    <el-col>
                        <span>选择商品分类: </span>
                        <!-- 选择商品分类的级联选择框 -->
                          <el-cascader style="width:240px"
                            v-model="selectedCateKeys"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-col>
                </el-row>

                <!-- tab 页签区 -->
                <el-tabs v-model="activeName" @tab-click="handleTabClick">
                    <!-- 添加动态参数的面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <el-button type="primary" size="mini"
                        :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTableData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                    :key=i closable @close="handleClose(i,scope.row)">
                                        {{item}}
                                    </el-tag>
                                    
                                    <!-- 输入文本框 -->
                                    <el-input
                                        style="width: 150px;"
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮 -->
                                    <el-button v-else class="button-new-tag" 
                                        size="small" @click="showInput(scope.row)">
                                        + New Tag
                                    </el-button>
                                </template>
                            </el-table-column>
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>   
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>    
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                    <!-- 添加静态属性的面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <el-button type="primary" size="mini"
                        :disabled="isBtnDisabled"  @click="addDialogVisible=true">添加属性</el-button>
                        <!-- 静态属性表格 -->
                        <el-table :data="onlyTableData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                                <template slot-scope="scope">
                                    <!-- 循环渲染tag标签 -->
                                    <el-tag v-for="(item,i) in scope.row.attr_vals" 
                                    :key=i closable @close="handleClose(i,scope.row)">
                                        {{item}}
                                    </el-tag>
                                    
                                    <!-- 输入文本框 -->
                                    <el-input
                                        style="width: 150px;"
                                        class="input-new-tag"
                                        v-if="scope.row.inputVisible"
                                        v-model="scope.row.inputValue"
                                        ref="saveTagInput"
                                        size="small"
                                        @keyup.enter.native="handleInputConfirm(scope.row)"
                                        @blur="handleInputConfirm(scope.row)"
                                        >
                                    </el-input>
                                    <!-- 添加按钮 -->
                                    <el-button v-else class="button-new-tag" 
                                        size="small" @click="showInput(scope.row)">
                                        + New Tag
                                    </el-button>
                                </template>
                            </el-table-column>
                            <el-table-column type="index"></el-table-column>
                            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                    <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>   
                                    <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>    
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                </el-tabs>
        </el-card>

        <!-- 添加参数的对话框 -->
        <el-dialog
            :title='"添加"+titleText'
            :visible.sync="addDialogVisible"
            width="35%" @close="addDialogClosed">
            <!-- 添加参数的表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改参数的对话框 -->
        <el-dialog
            :title='"修改"+titleText'
            :visible.sync="editDialogVisible"
            width="35%">
            <!-- 修改参数的表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px" >
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>

export default {
    data() {
        return {
            //商品分类列表
            catelist:[],
            //级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children',
                expandTrigger: 'hover'
            },
            //级联双向绑定到的数组
            selectedCateKeys:[],
            //被激活页签的名称
            activeName:'many',
            //动态参数的数据
            manyTableData:[],
            //静态参数的数据
            onlyTableData:[],
            //控制添加对话框的显示与隐藏
            addDialogVisible:false,
            //添加参数的表单对象
            addForm:{
                attr_name:''
            },
            //添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制修改对话框的显示与隐藏
            editDialogVisible:false,
            //修改的表单数据对象
            editForm:{},
            //修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                    { required: true,message:'请输入参数名称',trigger:'blur'}
                ]
            },
            //控制按钮与文本框的切换显示
            inputVisible:false,
            //文本框中输入的内容
            inputValue:'',


        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        //获取所有的商品分类列表
        async getCateList(){
           const { data : res } = await this.$http.get('categories')
           if(res.meta.status !== 200 ){
            return this.$message.error('获取商品分类参数失败！')
           }
           this.catelist = res.data
           console.log(this.catelist)
        },
        //级联选择框变化触发
        handleChange(){
            this.getParamsData()

        },
        //tab页签点击事件的处理函数
        handleTabClick(){
            console.log(this.activeName)
            this.getParamsData()
        },
        //获取参数列表数据
        async getParamsData(){
            if( this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return 
            }
            //证明选中的是三级分类
            console.log(this.selectedCateKeys)
            //根据所选分类的id，和当前所处的面版，获取对应的参数
            const { data : res } = await this.$http.get(`categories/${this.cateId}
            /attributes`,{
                params:{sel:this.activeName}
            })
            if(res.meta.status !== 200 ){
                return this.$message.error('获取参数列表失败！')
            }
            
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ?
                item.attr_vals.split(' ') : []
                //控制文本框的显示与隐藏  自定义属性
                item.inputVisible = false
                //文本框中的输入值
                item.inputValue = ''
            })
            console.log(res.data)
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }
        },
        //监听添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        //点击按钮添加参数
        addParams(){
            this.$refs.addFormRef.validate( async valid => {
                if(!valid)return
                const {data : res } = await this.$http.post(`categories/${this.cateId}
                /attributes`,{
                    attr_name:this.addForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        //点击按钮，展示修改的对话框
        async showEditDialog(attr_id){
            //查询当前参数的信息
            const {data : res} = await this.$http.get(`categories/${this.cateId}
                /attributes/ ${attr_id}`,{params:{attr_sel:this.activeName}})
            if(res.meta.status !== 200){
                this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        //点击按钮，修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid =>{
                if(!valid) return
                const {data : res} = await this.$http.put(`categories/${this.cateId}
                /attributes/${this.editForm.attr_id}`,{ 
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                })
                if(res.meta.status !== 200){
                    this.$message.error('修改参数信息失败！')
                }
                this.$message.success("修改参数成功！")
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        //根据id删除对应的参数项
        async removeParams(attr_id){
            //弹窗
            const res = await this.$confirm('是否删除该分类, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
            }).catch(err =>  err)
            //如果用户确认删除，则返回值为字符串confirm
            //如果用户确认删除，则返回值为字符串cancel
            if(res !== 'confirm'){
                return this.$message.info('已取消删除')
            }
            const {data:res2} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)

            if(res2.meta.status !== 200){
              return this.$message.error('删除参数信息失败！')
            }
            this.$message.success('删除参数信息成功！')
            this.getParamsData()
            
        },
        // 文本框失去焦点或者 按下 Enter 键都会触发
        async handleInputConfirm(row){
            if(row.inputValue.trim().length ===0 ){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            //如果没有return，则证明有输入内容，需要处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            //需要发起请求保存操作
            this.saveAttrVals(row)

        }, 
        //将对 attr_vals 的操作 保存到数据库
        async saveAttrVals(row){
            //需要发起请求保存操作
            const {data : res} = await 
            this.$http.put(`categories/${this.cateId}
            /attributes/${row.attr_id}`,{ 
                attr_name : row.attr_name,
                attr_sel : row.attr_sel,
                attr_vals : row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200){
                this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        //点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            //让文本框自动获得焦点
            //$nextTick 当页面上元素被重新渲染之后，才会执行回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        //删除对应的参数可选项
        handleClose(i,row){
            //删除对应索引数组元素
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }  
    },
    computed:{
        //如果按钮需要被禁用，则返回true，否则返回false
        isBtnDisabled(){
            if( this.selectedCateKeys.length !== 3){
                return true
            }
            return false
        },
        //当前选中的三级分类的id
        cateId(){
            if( this.selectedCateKeys.length ===3 ){
                return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        }
    }
}
</script>
<style lang="less" scope>
::v-deep.cat_opt{
    margin: 15px 0;
}

</style>